Scapulohumeral (intrinsic shoulder) muscles

Question 0

Deltoid insertion

Answer 0

Deltoid tuberosity of humerus

Question 1

Deltoid origin

Answer 1

Lateral third of clavicle
Acromion
Spine of scapula

Question 2

Deltoid innervation

Answer 2

Axillary nerve (C5, C6)

Question 3

Deltoid actions

Answer 3

Clavicular (anterior) part flexes and medially rotates shoulder joint
Acromial (middle) part abducts shoulder joint
Spinal (posterior) part extends and laterally rotates shoulder joint

Question 4

Supraspinatus origin

Answer 4

Supraspinous fossa of scapula

Question 5

Supraspinatus insertion

Answer 5

Superior facet of greater tubercle of humerus

Question 6

Supraspinatus innervation

Answer 6

Suprascapular nerve (C4, C5, C6)

Question 7

Supraspinatus action

Answer 7

Initiates and assists deltoid in abduction of shoulder joint and acts with other rotator cuff muscles

Question 8

Infraspinatus origin

Answer 8

Infraspinous fossa of scapula

Question 9

Infraspinatus insertion

Answer 9

Middle facet of greater tubercle of humerus

Question 10

Infraspinatus innervation

Answer 10

Suprascapular nerve (C5, C6)

Question 11

Infraspinatus action

Answer 11

Laterally rotate shoulder joint

Help hold humeral head in glenoid cavity of scapula

Question 12

Teres minor origin

Answer 12

Middle part of lateral border of scapula

Question 13

Teres minor insertion

Answer 13

Inferior facet of greater tubercle of humerus

Question 14

Teres minor innervation

Answer 14

Axillary nerve (C5, C6)

Question 15

Teres minor action

Answer 15

Laterally rotate shoulder joint

Help hold humeral head in glenoid cavity of scapula

Question 16

Teres major origin

Answer 16

Inferior part of lateral border of scapula and posterior surface of inferior angle of scapula

Question 17

Teres major insertion

Answer 17

Medial lip of intertubercular sulcus of humerus

Question 18

Teres major innervation

Answer 18

Lower subscapular nerve (C5, C6)

Question 19

Teres major action

Answer 19

Adducts and medially rotates shoulder joint

Question 20

Subscapularis origin

Answer 20

Subscapular fossa (most of anterior surface of scapula)

Question 21

Subscapularis insertion

Answer 21

Lesser tubercle of humerus

Question 22

Subscapularis innervation

Answer 22

Upper and low subscapular nerve (C5, C6, C7)

Question 23

Subscapularis action

Answer 23

Medially rotates and adducts shoulder joint

Helps hold humeral head in glenoid cavity